update Cassandra row according to value comparison
I need to update row in Cassandra table if the value greater than the stored value or not can I make this process on one transaction or I must select first to compare ?!
java nosql cassandra-3.0 cql3
asked Nov 13 '18 at 13:45
Mohamad HatemMohamad Hatem
285
add a comment |
I need to update row in Cassandra table if the value greater than the stored value or not can I make this process on one transaction or I must select first to compare ?!
java nosql cassandra-3.0 cql3
asked Nov 13 '18 at 13:45
Mohamad HatemMohamad Hatem
285
"if the value greater than the stored value or not"... What do you mean? What do you do if the value is not greater? Skip the update?
– ernest_k
Nov 13 '18 at 16:32
yes I'll skip the update if the value not greater
– Mohamad Hatem
Nov 14 '18 at 8:19
Then just use conditional updates as proposed below. You can find the documentation here: docs.datastax.com/en/cql/3.3/cql/cql_reference/…
– ernest_k
Nov 14 '18 at 8:33
add a comment |
I need to update row in Cassandra table if the value greater than the stored value or not can I make this process on one transaction or I must select first to compare ?!
java nosql cassandra-3.0 cql3
asked Nov 13 '18 at 13:45
Mohamad HatemMohamad Hatem
285
I need to update row in Cassandra table if the value greater than the stored value or not can I make this process on one transaction or I must select first to compare ?!
java nosql cassandra-3.0 cql3
java nosql cassandra-3.0 cql3
asked Nov 13 '18 at 13:45
Mohamad HatemMohamad Hatem
285
asked Nov 13 '18 at 13:45
Mohamad HatemMohamad Hatem
285
asked Nov 13 '18 at 13:45
Mohamad HatemMohamad Hatem
285
asked Nov 13 '18 at 13:45
Mohamad HatemMohamad Hatem
285
asked Nov 13 '18 at 13:45
Mohamad HatemMohamad Hatem
285
285
"if the value greater than the stored value or not"... What do you mean? What do you do if the value is not greater? Skip the update?
– ernest_k
Nov 13 '18 at 16:32
yes I'll skip the update if the value not greater
– Mohamad Hatem
Nov 14 '18 at 8:19
Then just use conditional updates as proposed below. You can find the documentation here: docs.datastax.com/en/cql/3.3/cql/cql_reference/…
– ernest_k
Nov 14 '18 at 8:33
add a comment |
"if the value greater than the stored value or not"... What do you mean? What do you do if the value is not greater? Skip the update?
– ernest_k
Nov 13 '18 at 16:32
yes I'll skip the update if the value not greater
– Mohamad Hatem
Nov 14 '18 at 8:19
Then just use conditional updates as proposed below. You can find the documentation here: docs.datastax.com/en/cql/3.3/cql/cql_reference/…
– ernest_k
Nov 14 '18 at 8:33
"if the value greater than the stored value or not"... What do you mean? What do you do if the value is not greater? Skip the update?– ernest_k
Nov 13 '18 at 16:32
"if the value greater than the stored value or not"... What do you mean? What do you do if the value is not greater? Skip the update?– ernest_k
Nov 13 '18 at 16:32
yes I'll skip the update if the value not greater
– Mohamad Hatem
Nov 14 '18 at 8:19
yes I'll skip the update if the value not greater
– Mohamad Hatem
Nov 14 '18 at 8:19
Then just use conditional updates as proposed below. You can find the documentation here: docs.datastax.com/en/cql/3.3/cql/cql_reference/…
– ernest_k
Nov 14 '18 at 8:33
Then just use conditional updates as proposed below. You can find the documentation here: docs.datastax.com/en/cql/3.3/cql/cql_reference/…
– ernest_k
Nov 14 '18 at 8:33
add a comment |
1 Answer
1
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votes
You can use UPDATE IF [condition] ,but note that it is LWT transaction and has high latency and should be avoided if not rarely used.
answered Nov 14 '18 at 4:30
LaxmikantLaxmikant
613413
what about UDF can I make using it ?!
– Mohamad Hatem
Nov 14 '18 at 15:19
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can use UPDATE IF [condition] ,but note that it is LWT transaction and has high latency and should be avoided if not rarely used.
answered Nov 14 '18 at 4:30
LaxmikantLaxmikant
613413
what about UDF can I make using it ?!
– Mohamad Hatem
Nov 14 '18 at 15:19
add a comment |
You can use UPDATE IF [condition] ,but note that it is LWT transaction and has high latency and should be avoided if not rarely used.
answered Nov 14 '18 at 4:30
LaxmikantLaxmikant
613413
what about UDF can I make using it ?!
– Mohamad Hatem
Nov 14 '18 at 15:19
add a comment |
You can use UPDATE IF [condition] ,but note that it is LWT transaction and has high latency and should be avoided if not rarely used.
answered Nov 14 '18 at 4:30
LaxmikantLaxmikant
613413
You can use UPDATE IF [condition] ,but note that it is LWT transaction and has high latency and should be avoided if not rarely used.
answered Nov 14 '18 at 4:30
LaxmikantLaxmikant
613413
answered Nov 14 '18 at 4:30
LaxmikantLaxmikant
613413
answered Nov 14 '18 at 4:30
LaxmikantLaxmikant
613413
answered Nov 14 '18 at 4:30
LaxmikantLaxmikant
613413
613413
what about UDF can I make using it ?!
– Mohamad Hatem
Nov 14 '18 at 15:19
add a comment |
what about UDF can I make using it ?!
– Mohamad Hatem
Nov 14 '18 at 15:19
what about UDF can I make using it ?!
– Mohamad Hatem
Nov 14 '18 at 15:19
what about UDF can I make using it ?!
– Mohamad Hatem
Nov 14 '18 at 15:19
add a comment |
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"if the value greater than the stored value or not"... What do you mean? What do you do if the value is not greater? Skip the update?– ernest_k
Nov 13 '18 at 16:32
yes I'll skip the update if the value not greater
– Mohamad Hatem
Nov 14 '18 at 8:19
Then just use conditional updates as proposed below. You can find the documentation here: docs.datastax.com/en/cql/3.3/cql/cql_reference/…
– ernest_k
Nov 14 '18 at 8:33